The 'Fashion Police' star was fuming when the singer tried to make amends with her mother Sharon Osbourne following her performance on 'The X Factor' UK on Sunday night (27.10.13) by presenting her with a birthday cake for Kelly, and immediately took to Twitter to inform Gaga she could ''eat my sh*t''.

The Osbournes have been locked in a bitter feud with Gaga for months, with Sharon branding the 'Applause' hitmaker - whose Born This Way Foundation campaigns against bullying - a ''publicity-seeking hypocrite'' for letting her fans send threatening messages to her daughter Kelly after she criticised Gaga's 2012 Grammy Awards outfit.

It seems 'X Factor' judge Sharon was willing to put the feud behind them as the former enemies hugged it out and posed together with a photo of a birthday cake Gaga had brought for Kelly. They had also met at London's G-A-Y nightclub on Saturday night (26.10.13).

However, outspoken Kelly - who was watching from the US - was far from impressed and took to Twitter to tell her nemesis what she really thought of her peacemaking skills.

In an increasingly angry series of tweets, she ranted: ''Not to be ungrateful but why would you send me a birthday cake via my MOTHER in a country half the would away? #JustSendItToME #LoveNotWar

''#EatMyShit #Hypocrisy / #StefaniStopIt! / You are so far behind you think you are first! / I live for a #Cause not for the #Applause!!!!!!!